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Finding the Fourth Proportional to 640,870.80, 961,306.20 and 613,568.40

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Solution

The fourth proportional to 640,870.80, 961,306.20 and 613,568.40 is: 920,352.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,870.80 : 961,306.20 = 613,568.40 : x
  2. Step 2: Convert to fraction form
    640,870.80/961,306.20 = 613,568.40/x
  3. Step 3: Cross multiply
    640,870.80x = 961,306.20 × 613,568.40
  4. Step 4: Simplify right side
    640,870.80x = 589,827,107,044.08
  5. Step 5: Solve for x
    x = 589,827,107,044.08/640,870.80
  6. Step 6: Final answer
    x = 920,352.60

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.